Additionally, the lens is also dust, freeze, and weather resistant for use in trying environmental conditions. Prime 50mm lens offers a 40mm equivalent focal length to realize a normal field of view for working with a variety of subjects. Impressively compact "pancake" design makes this lens especially portable and ideal for everyday shooting. The nine-element, six-group optical design incorporates one aspherical element to reduce spherical aberrations and distortions for cleaner, more realistic rendering and sharper image quality. A linear AF motor is used for especially quick and quiet focusing performance and is well-suited to both photo and video applications. Physical aperture ring allows for intuitive adjustment over exposure settings and incorporates a C (Command) position to permit camera-based aperture setting. Dust- and weather-sealed physical construction enables working in harsh climates and temperatures as low as 14°F. Rounded nine-blade diaphragm contributes to a pleasing bokeh quality.
